* {
    margin: 0;
    padding: 0;
}
li {
    list-style: none;
}
.tb-promo {
    position: relative;
    width: 520px;
    height: 280px;
    margin: 100px auto;
    background-color: pink;
}
.prev {
    position: absolute;
    top: 140px;
    left: 0;
    margin-top: -16px;
    margin-left: 2px;
}
.next {
    position: absolute;
    top: 140px;
    margin-top: -16px;
    right: 0;
    margin-right: 2px;
}
.promo-nav {
    position: absolute;
    bottom: 15px;
    left:  50%;
    margin-left: -35px;
    width: 70px;
    height: 13px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 7px;
}
.promo-nav li {
    float: left;
    width: 8px;
    height: 8px;
    background-color: #fff;
    border-radius: 50%;
    margin: 3px;
}